77 lines
3.2 KiB
HTML
77 lines
3.2 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Elements not participating to the layout of their parent</title>
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<link rel="help" href="https://w3c.github.io/mathml-core/#layout-algorithms">
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<meta name="assert" content="Verify that display: none and out-of-flow positioned elements do not participate to layout of their parent.">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/mathml/support/feature-detection.js"></script>
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<script src="/mathml/support/layout-comparison.js"></script>
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<script src="/mathml/support/mathml-fragments.js"></script>
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<script>
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var epsilon = 1;
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setup({ explicit_done: true });
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window.addEventListener("load", runTests);
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function runTests() {
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for (tag in MathMLFragments) {
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if (!FragmentHelper.isValidChildOfMrow(tag) ||
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FragmentHelper.isEmpty(tag))
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continue;
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["display: none",
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"display: contents",
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"position: absolute",
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"position: fixed"
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].forEach(style => {
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document.body.insertAdjacentHTML("beforeend", `<div style="position: absolute;">\
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<div style="display: inline-block"><math>${MathMLFragments[tag]}</math></div>\
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<div style="display: inline-block"><math>${MathMLFragments[tag]}</math></div>\
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</div>`);
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var div = document.body.lastElementChild;
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var elementContainer = div.firstElementChild;
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var elementContainerWidth = elementContainer.getBoundingClientRect().width;
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var element = FragmentHelper.element(elementContainer);
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if (style === "display: contents" &&
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!element.classList.contains("mathml-container")) {
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// A "display: contents" MathML child is not participating to
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// parent layout because its computed style is "display: none".
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// If we cannot append a MathML child then skip that test.
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return;
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}
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FragmentHelper.forceNonEmptyElement(element);
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var allowInvalid = true;
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var child = FragmentHelper.appendChild(element, allowInvalid);
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child.setAttribute("style", style);
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var referenceContainer = div.lastElementChild;
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var referenceContainerWidth = referenceContainer.getBoundingClientRect().width;
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var reference = FragmentHelper.element(referenceContainer);
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FragmentHelper.forceNonEmptyElement(reference);
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test(function() {
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assert_true(MathMLFeatureDetection[`has_${tag}`](), `${tag} is supported`);
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assert_approx_equals(elementContainerWidth, referenceContainerWidth, epsilon);
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}, `${tag} preferred width calculation is not affected by children with "${style}" style`);
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test(function() {
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assert_true(MathMLFeatureDetection[`has_${tag}`](), `${tag} is supported`);
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compareLayout(element, reference, epsilon);
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}, `${tag} layout is not affected by children with "${style}" style`);
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div.style = "display: none;"; // Hide the div after measurement.
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});
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}
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done();
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}
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</script>
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</head>
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<body>
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<div id="log"></div>
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</body>
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</html>
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